Investigators say six people aboard a private plane died when it crashed in a San Diego neighborhood in heavy fog.

Investigators are piecing together the final moments before a small private jet crashed into a San Diego neighborhood, killing all passengers on board. According to the NTSB, the skies were foggy, and that the destination airport’s runway approach lights and automated weather reports were not functioning properly.

The pilot of a small private plane that crashed in a residential neighborhood of San Diego earlier this week faced fog as he attempted to land, while runway lights and a weather alert system at the airport were not working,